Happened to recognize that as a Sears model number. Your gun was made for Sears in the early 1960s. It is a Springfield (by Savage) model 947. It probably has no serial number, as they were not required on shotguns prior to 1968.
Your shotgun was made for Belnap by the firm Savage arms Company.These were listed under 2 models,first the Savage model 947B,second the Springfield model 947.Both shotguns are the same identical shotgun as yours.The value will range from 35-110 dollars,depending on overall condition and a good bore.
The value of a Springfield Model 947 B Proof Tested 12 gauge would actually be dependent upon a number of things. The main thing that would be considered would be the condition.
About $50-$75
Try a Stevens 940 and a Springfield 947
Single shot break action shotgun? If so, most likely a Springfield 947. Depending on condition, value is about $75. Well made, reliable shotgun- just not a very pricey one.
The JC Higgins 101.40 is a version of the Savage/Stevens 940/947 series. Should be a single-shot shotgun. Made probably in the 1960's, value definitely tops out at $100. sales@countrygunsmith.net
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30% of 947= 30% * 947= 0.3 * 947= 284.1
947
-947
947 = CMXLVII